initial import of 386bsd-0.1 sources

3 files changed, 234 insertions, 0 deletions

diff --git a/caesar/Makefile b/caesar/Makefile
new file mode 100644
index 00000000..c35de8f4
--- /dev/null
+++ b/caesar/Makefile
@@ -0,0 +1,9 @@
+#	@(#)Makefile	5.2 (Berkeley) 5/11/90
+
+PROG=	caesar
+MAN6=	caesar.0
+DPADD=	${LIBM}
+LDADD=	-lm
+MLINKS=	caesar.6 rot13.6
+
+.include <bsd.prog.mk>
diff --git a/caesar/caesar.6 b/caesar/caesar.6
new file mode 100644
index 00000000..c9d3b832
--- /dev/null
+++ b/caesar/caesar.6
@@ -0,0 +1,71 @@
+.\" Copyright (c) 1989 The Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)caesar.6	5.3 (Berkeley) 11/11/90
+.\"
+.TH CAESAR 6 "November 11, 1990"
+.UC 7
+.SH NAME
+caesar \- decrypt caesar cyphers
+.SH SYNOPSIS
+.B caesar
+[
+.B rotation
+]
+.SH DESCRIPTION
+The
+.I caesar
+utility attempts to decrypt caesar cyphers using English letter frequency
+statistics.
+.I Caesar
+reads from the standard input and writes to the standard output.
+.PP
+The optional numerical argument
+.I rotation
+may be used to specify a specific rotation value.
+.PP
+The frequency (from most common to least) of English letters is as follows:
+.sp
+.RS
+ETAONRISHDLFCMUGPYWBVKXJQZ
+.RE
+.PP
+Their frequencies as a percentage are as follows:
+.sp
+.RS
+E(13), T(10.5), A(8.1), O(7.9), N(7.1), R(6.8), I(6.3), S(6.1), H(5.2),
+D(3.8), L(3.4), F(2.9), C(2.7), M(2.5), U(2.4), G(2), P(1.9), Y(1.9),
+W(1.5), B(1.4), V(.9), K(.4), X(.15), J(.13), Q(.11), Z(.07).
+.RE
+.PP
+Rotated postings to USENET and some of the databases used by the
+.IR fortune (6)
+program are rotated by 13 characters.
diff --git a/caesar/caesar.c b/caesar/caesar.c
new file mode 100644
index 00000000..2951a02c
--- /dev/null
+++ b/caesar/caesar.c
@@ -0,0 +1,154 @@
+/*
+ * Copyright (c) 1989 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Rick Adams.
+ *
+ * Authors:
+ *	Stan King, John Eldridge, based on algorithm suggested by
+ *	Bob Morris
+ * 29-Sep-82
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+char copyright[] =
+"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)caesar.c	5.4 (Berkeley) 6/1/90";
+#endif /* not lint */
+
+#include <math.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <unistd.h>
+
+#define	LINELENGTH	2048
+#define	ROTATE(ch, perm) \
+	isupper(ch) ? ('A' + (ch - 'A' + perm) % 26) : \
+	    islower(ch) ? ('a' + (ch - 'a' + perm) % 26) : ch
+
+/*
+ * letter frequencies (taken from some unix(tm) documentation)
+ * (unix is a trademark of Bell Laboratories)
+ */
+double stdf[26] = {
+	7.97, 1.35, 3.61, 4.78, 12.37, 2.01, 1.46, 4.49, 6.39, 0.04,
+	0.42, 3.81, 2.69, 5.92,  6.96, 2.91, 0.08, 6.63, 8.77, 9.68,
+	2.62, 0.81, 1.88, 0.23,  2.07, 0.06,
+};
+
+main(argc, argv)
+	int argc;
+	char **argv;
+{
+	extern int errno;
+	register int ch, dot, i, nread, winnerdot;
+	register char *inbuf;
+	int obs[26], try, winner;
+	char *malloc(), *strerror();
+
+	if (argc > 1)
+		printit(argv[1]);
+
+	if (!(inbuf = malloc(LINELENGTH))) {
+		(void)fprintf(stderr, "caesar: out of memory.\n");
+		exit(1);
+	}
+
+	/* adjust frequency table to weight low probs REAL low */
+	for (i = 0; i < 26; ++i)
+		stdf[i] = log(stdf[i]) + log(26.0 / 100.0);
+
+	/* zero out observation table */
+	bzero(obs, 26 * sizeof(int));
+
+	if ((nread = read(STDIN_FILENO, inbuf, LINELENGTH)) < 0) {
+		(void)fprintf(stderr, "caesar: %s\n", strerror(errno));
+		exit(1);
+	}
+	for (i = nread; i--;) {
+		ch = inbuf[i];
+		if (islower(ch))
+			++obs[ch - 'a'];
+		else if (isupper(ch))
+			++obs[ch - 'A'];
+	}
+
+	/*
+	 * now "dot" the freqs with the observed letter freqs
+	 * and keep track of best fit
+	 */
+	for (try = winner = 0; try < 26; ++try) { /* += 13) { */
+		dot = 0;
+		for (i = 0; i < 26; i++)
+			dot += obs[i] * stdf[(i + try) % 26];
+		/* initialize winning score */
+		if (try == 0)
+			winnerdot = dot;
+		if (dot > winnerdot) {
+			/* got a new winner! */
+			winner = try;
+			winnerdot = dot;
+		}
+	}
+
+	for (;;) {
+		for (i = 0; i < nread; ++i) {
+			ch = inbuf[i];
+			putchar(ROTATE(ch, winner));
+		}
+		if (nread < LINELENGTH)
+			break;
+		if ((nread = read(STDIN_FILENO, inbuf, LINELENGTH)) < 0) {
+			(void)fprintf(stderr, "caesar: %s\n", strerror(errno));
+			exit(1);
+		}
+	}
+	exit(0);
+}
+
+printit(arg)
+	char *arg;
+{
+	register int ch, rot;
+
+	if ((rot = atoi(arg)) < 0) {
+		(void)fprintf(stderr, "caesar: bad rotation value.\n");
+		exit(1);
+	}
+	while ((ch = getchar()) != EOF)
+		putchar(ROTATE(ch, rot));
+	exit(0);
+}